Kalshi or Polymarket for Sports? A Side-by-Side That Includes Access
Two markets, two rulebooks, and different doors for a non-US bettor. Both price a Yes and a No in cents; the rules around them differ.
Kalshi and Polymarket trade the same kind of Yes/No contract under different rulebooks. Kalshi lists Yes/No sports-title contracts on a CFTC-regulated exchange, trades member against member, and funds non-US accounts by card, a wire of $1,000 or more, or crypto only. Polymarket runs two products: a peer-to-peer international site for non-US, non-restricted bettors, and a US-only app under its own CFTC designation. Polymarket's own geoblock pages disagree on which countries are close-only and which are fully restricted. Whether a broker route helps someone in a restricted country reach either platform is not settled in either operator's terms. Kalshi's sports contracts are also mid-case in the US, with one appeals court siding with it and another against it, on the same question. Compare the mechanism and access first; the fee formulas differ too. Check local law.
Quick verdict, before the mechanism
This page sits inside the wider spread of sports and markets on this site, and stays narrow: two contract markets, not every predictive product out there. Three things it will not do:
- Settle the court case below, only report where it currently stands.
- Confirm your own country is clear, only point at the operator's own lists.
- Blend two different fee formulas into one tidy number.
Two quick reads, then the table.
Comfortable with a crypto wallet
Someone who already holds crypto, does not mind an on-chain wallet over a card-or-wire account, and has checked their country against both Polymarket lists.
Your country shows up on either list, or you would rather not manage a wallet at all.
Wants a single account, card or wire
Someone who would rather fund by card or a wire of $1,000 or more than manage a crypto wallet, and whose country clears Kalshi's restricted-jurisdiction list.
That list names your country (it has grown between archived copies), or you need ACH, PayPal or Venmo, none of which Kalshi accepts from outside the US.
Kalshi and Polymarket, side by side
Strip away the branding: two facts decide almost everything else, who sits on the other side of your position, and which rulebook signed off on the contract. The table is the shape of the trade; the rest of the page unpacks each row.
| What you check | Kalshi | Polymarket |
|---|---|---|
| What it is | Yes/No sports-title contracts, $1.00 or $0.00 | Yes/No shares, $0.00 to $1.00; a separate US app runs the same idea |
| Regulator | CFTC Designated Contract Market since 2020; sports self-certified in 2025 | International site: not CFTC-regulated. Polymarket US: a separate CFTC exchange, designated in 2025 |
| Who is on the other side | Another Kalshi member, not the house | Another Polymarket user; the operator states there is no house to face |
| Funding from outside the US | Card, wire ($1,000+), or crypto; no ACH, PayPal or Venmo | A crypto wallet, bridged into pUSD; card and ACH exist on the US app, for US residents |
| Taker fee formula | 0.07 x contracts x price x (1 minus price) | 0.05 x shares x price x (1 minus price), on international sports |
| Country list | A restricted-jurisdiction list in the Member Agreement; it has changed between archived copies | Two official lists that disagree with each other on blocked versus close-only |
Two of those rows will go stale before this page's next edit. Fees and lists move; the mechanism does not.
Same formula shape, two different multipliers.
How the mechanism actually differs
Start with the counterparty. Kalshi's help centre says a member is "always trading against another member of the platform, not the exchange itself". Polymarket says something close: a trader trades shares with other users, not a house.
Settlement is where the two part ways. Kalshi's contracts usually settle within a few hours, from named sources such as AP, ESPN and the Wall Street Journal. No source, no settlement. Simple, until the source disagrees with itself. Polymarket's international site resolves differently: a proposer posts a bond, typically 750 pUSD, and a challenge window opens.
Undisputed, Polymarket runs about two hours, close to Kalshi's usual few. Disputed, the question escalates to a token-holder vote and can run four to six days: the case to price in before trading a market you need closed soon.
How a back and lay order book actually fills a bet covers the exchange side in full. Short version: both run a central order book, priced in cents instead of decimal odds. Polymarket adds a wrinkle: resting orders cancel the moment a game starts, and sports markets add a three-second delay on new ones.
Good. Now the arithmetic.
What each one actually costs
Both fees follow the same shape: contracts times price times one minus price, so the charge peaks at a coin-flip price. The multiplier in front differs, and the two are not interchangeable.
Where each one runs out
A homepage never leads with its weak spots. See also how these stack up against the traditional exchanges, if a back and lay queue suits you better than a Yes/No contract.
Kalshi
Strengths
- Named settlement sources, known in advance.
- Positions can be sold before settlement.
- No settlement fee and no membership fee.
Limits
- Single account only, by its own rule.
- Funding from outside the US stops at card, wire or crypto.
- A restricted-jurisdiction list that has grown between archived copies.
Polymarket
Strengths
- The operator's own words: no "house" to ban you for winning too much.
- Positions can be sold before resolution.
- Public API and documentation.
Limits
- Resolution runs through a bonded proposer and a possible vote: four to six days once disputed.
- Resting orders cancel at kickoff.
- Two geoblock lists that disagree, so status is not one answer.
Access, broker by broker, and a conflict worth printing
This site's coverage count credits BetInAsia with both Kalshi and Polymarket, via its BLACK screen. BetInAsia's own archived Kalshi page disagrees: those odds, it says, are no longer available, pointing instead to Sharp Exchange. Its live page is blocked to us, so check current availability directly with BetInAsia before registering on this count alone. Its Polymarket listing is unverified too: that page is blocked to us as well, so only a search result and a third-party review could be read.
Set BetInAsia aside. On their own pages, the two brokers that list either platform at all are MadMarket and Sportmarket, and even they disagree. MadMarket's banner and one Edge sentence say both are live, though Kalshi never appears in Edge's own bookmaker list. Sportmarket runs the other way: its "Prediction Markets" row names Polymarket and a second entry, "PMK", never Kalshi; PMK's identity has not turned up anywhere, so do not assume it is Kalshi under another name. Sportmarket also claims its live prediction-market bets are "taken instantly with no time delay", awkward next to Polymarket's own stated order delay. Which broker reaches which exchange runs the fuller comparison.
Kalshi's Member Agreement, Section VI, moves too, since an earlier archived copy of that same document lacks India, Ireland and Portugal that a later copy adds to the restricted list, so link the live agreement rather than trust a screenshot, this page's own quotes included, and treat today's copy as one snapshot in a list that keeps changing. The current copies of all three lists name the United Kingdom and France somewhere.
A different question some readers have: whether a Yes/No contract was ever the tool they wanted. If Betfair Exchange is what you are after, horse racing is a market built on a different clock entirely, and the direct and broker routes onto that exchange skip this court question entirely.
Seven lines worth checking before you fund either one:
- Does your country clear both Polymarket lists?
- Has Kalshi's restricted list added your country lately?
- Does your funding method actually clear for Kalshi?
- Is your crypto wallet ready to bridge into pUSD?
- Does the broker's current page name the platform you want?
- Does it explain how a shared account works here?
- What does today's fee schedule say, not this page?
The court case neither side has won yet
Kalshi's sports contracts are mid-case in the United States. In 2026, the Third Circuit, in a New Jersey case, sided with Kalshi: its ruling found a reasonable chance federal commodities rules override the state rule used against it. That same year, the Ninth Circuit, in a Nevada case, went the other way on the identical question. Two federal appeals courts, one point of law, opposite answers, one year.
Neither ruling ends the story: treat both opinions as live, not final, whichever circuit a reader sits under. A court case is not the kind of fact a broker's marketing page updates for you; MadMarket's own review on this site and Sportmarket's own review at least state each one's current list. Check local law before treating either ruling as settled.
Questions people ask
Does either court ruling settle whether Kalshi's sports contracts are allowed?
No. In 2026 the Third Circuit sided with Kalshi and the Ninth Circuit sided against it, on the same federal-versus-state question. Treat both as live, not final, and check local law.
Which of Polymarket's two country lists should I trust?
Neither on its own. Its API documentation and its Help Centre disagree on close-only versus fully restricted, Ireland and the United Kingdom among them. Check both before assuming a status.
Do I need ID to use Polymarket?
Its international sign-up article does not describe an identity-document step, but that silence is not proof either way. Expect identity checks to appear before you can withdraw, on either platform.
Is Kalshi available through BetInAsia?
This site's coverage count credits BetInAsia with Kalshi via BLACK, but BetInAsia's own archived Kalshi page says those odds are no longer available, and its live page is blocked to us. Check current availability directly with BetInAsia.
What is "PMK" on Sportmarket's bookmaker list?
Sportmarket names Polymarket and a second entry called PMK under Prediction Markets, never Kalshi. What PMK actually is has not turned up on any page we could read, so do not assume it is Kalshi under another name.